ABSTRACT
This chapter discusses the five compositional techniques or circumstances that engender form-functional difficulties: an expected function is simply omitted and a passage that people assume to reappear is substituted by a different passage, albeit one that still fulfils the expected function. The techniques or circumstances also include: new material is interpolated within an otherwise conventional succession of functions; a given passage is rendered highly obscure in its form-functional expression; and a passage produces only an incipient sense of its formal functionality. Following the end of the development, Johann Nepomuk Hummel brings back material from the slow introduction, a procedure that has little precedent in conventional Classical genres. The chapter discusses the norms of Classical formal organisation either explicitly presented or as a controlling force somewhat hidden in the background. Indeed, attaining a fine balance between the formal freedom of the improvisational impulse and the formal conventionality of the standard composed genres seems to be the underlying aesthetic of the fantasia genre.
